Fluid switching device for mine cooling system

Abstract

The utility model belongs to the technical field of fluid switching, and discloses a fluid switching device for a mine cooling system, which mainly comprises a switching body, an inner cylinder, a switching column and a blind end, the switching body is provided with a first axial connector, a third axial connector, a second radial connector and a fourth radial connector. The inner barrel is arranged in the switching body, a second groove and a plurality of circulating holes in the second groove are formed in the position, corresponding to the fourth connector, of the inner barrel, and the circulating holes are used for achieving communication between an inner flow channel of the inner barrel and the fourth connector; the blind end is installed on a first connector of the switching body, the switching column is installed in the switching body and the inner cylinder, and under driving of an external driving mechanism, the switching column does axial reciprocating motion along the inner cylinder within a limited distance, and communication of different fluid flow channels is achieved. The pressure pre-balancing valve bank can replace an existing balance valve bank, achieves the pressure pre-balancing function, reduces driving energy consumption of a device, and has the advantages of being compact in overall structure, simple in driving control logic, good in sealing performance, convenient to install and maintain in the later period and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fluid switching technical field, specifically, relate to a fluid switching device for mine cooling system. BACKGROUND

[0002] With the increasing of coal mining depth, the mine heat damage problem is more and more serious. As the key technology of mine heat damage prevention and control, the ground centralized cooling system is widely used. The system involves the pressure energy conversion of high and low pressure fluid, i.e. the pressure reduction of high pressure fluid and the pressure increase of low pressure fluid. Generally, the valve controlled pressure energy conversion device is used, which is mainly composed of pressure exchange cylinder body and switching valve group and check valve group at both ends. The switching valve group includes two switching valves, which are connected with the cylinder body, high pressure fluid connector and low pressure fluid connector respectively. Before the switching valve is opened, the valve plate is high and low pressure fluid, and the pressure difference causes the opening resistance of the switching valve to be large. Therefore, a small size balance valve is additionally provided to open the balance valve in advance before the switching valve is opened, and the pressure of the fluid on both sides of the switching valve is pre-balanced, and then the switching valve is opened to reduce the driving energy consumption of the device.

[0003] For the valve controlled pressure energy conversion device, in order to realize the pre-balance of the pressure on both sides of the valve plate before the switching valve is opened, a set of balance valve group is additionally provided on the basis of the switching valve group, which generally includes two balance valves connected with the cylinder body, high pressure fluid connector and low pressure fluid connector respectively. The size of the balance valve is much smaller than that of the switching valve, so the opening resistance is also much smaller, and the pressure balance function can be realized. However, the additional two balance valves and the matching pipeline increase the complexity of the device structure and valve group control, and the sealing performance of the existing balance valve needs to be improved. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of fluid switching device, for the pressure energy conversion device of mine cooling system, replace existing balance valve group, realize pressure pre-balance function, reduce the driving energy consumption of device, with compact overall structure, driving control logic is simple, sealing performance is good, installation and later maintenance are convenient and so on Characteristics.

[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0006] The utility model provides a kind of fluid switching device for mine cooling system, including switching body;The switching body includes the circular main pipe of axial through, and the two ends of the circular main pipe are respectively set as first interface and third interface;The circular main pipe of the switching body is communicated with two circular branch pipes, and the axial direction of the circular branch pipe is along the radial direction of the circular main pipe, and the port of two the circular branch pipe is respectively set as second interface and fourth interface;Wherein, the fourth interface is located between the second interface and third interface;Wherein, the inner rotary surface of the third interface is provided with groove, and the inner diameter of the groove is greater than the inner diameter of the circular main pipe, for cooperating with outer boss to realize the location installation of inner cylinder;

[0007] The inner cylinder is installed in the switching body, and the outer diameter of the inner cylinder matches the inner diameter of the circular main pipe of the switching body;The second groove is provided on the position corresponding to the fourth interface in the axial direction of the inner cylinder, and the second groove is arranged in the circumferential direction of the outer rotary surface of the inner cylinder;And a plurality of flow-through holes are provided in the second groove, and the plurality of flow-through holes are arranged in the circumferential direction of the inner cylinder in the second groove, and the flow-through holes can communicate between the inner flow passage of the inner cylinder and the fourth interface;The first groove and the third groove are respectively arranged between the second groove and the two ends of the inner cylinder in the axial direction of the inner cylinder, and the first groove and the third groove are both arranged in the circumferential direction of the outer rotary surface of the inner cylinder, and are both used for installing static sealing structure;One end of the inner cylinder is provided with an outer boss and an inner boss, and the outer boss and the inner boss are arranged in the circumferential direction of the outer rotary surface and the inner rotary surface of the inner cylinder respectively;The outer diameter of the outer boss matches the inner diameter of the groove of the third interface, for limiting the inner cylinder;The inner diameter of the inner boss is less than the outer diameter of the column section of the switching column, for limiting the end of the column section;

[0008] The switching column is installed in the switching body and the inner cylinder, and the switching column includes a shaft section and a column section, and the column section can move axially within the inner cylinder;The outer diameter of the shaft section is less than the column section;The outer diameter of the column section matches the inner diameter of the inner cylinder, so that the column section can move axially relative to the inner cylinder;The end of the shaft section penetrates the blind end, and is used for connecting an external driving mechanism;The shaft section is provided with a limiting shoulder, and the limiting shoulder is used for limiting the switching column in the blind end;The column section of the switching column is provided with a dynamic sealing structure, and when the dynamic sealing structure is located at the two ends of the second groove or blocks the flow-through hole of the second groove, the fourth interface is not communicated with the second interface and the third interface;

[0009] The first interface of the switching body is connected with a blind end, and a static sealing structure is arranged between the blind end and the switching body; the blind end is provided with a through hole along a central axis thereof, and the through hole is used for penetrating the shaft section of the switching column, and a dynamic sealing structure is arranged between the blind end and the shaft section;

[0010] The length of the inner cylinder extends from the third interface of the switching body to between the second interface and the fourth interface; when the switching column moves to the state that the column section is limited by the inner boss of the inner cylinder, the column section is located in the range of the inner cylinder between the third interface and the fourth interface; when the switching column moves to the state that the shaft section is limited by the blind end, the column section is located in the range of the inner cylinder between the second interface and the fourth interface.

[0011] Further, a plurality of groups of the flow-through holes are uniformly distributed along the circumference of the inner cylinder, and a plurality of flow-through holes in each group are uniformly distributed along the axial direction of the inner cylinder.

[0012] Further, the maximum dimension of the cross section of the flow-through hole is smaller than the width of the dynamic sealing structure of the switching column.

[0013] Further, the outer boss and the inner boss are integrally formed.

[0014] Further, the end of the shaft section is provided with a threaded structure for connecting an external driving mechanism.

[0015] Further, the column section is provided with a first dynamic sealing groove and a second dynamic sealing groove which are spaced apart along the axial direction, the first dynamic sealing groove and the second dynamic sealing groove are arranged along the entire circumference of the outer rotary surface of the column section, and are used for mounting dynamic sealing structures; the axial distance between the two dynamic sealing structures is greater than the inner diameter of the fourth interface.

[0016] Further, the column section is provided with an integral dynamic sealing structure which is arranged along the entire circumference of the outer rotary surface of the column section, and the axial length of the integral dynamic sealing structure is greater than the inner diameter of the fourth interface.

[0017] The beneficial effects of the utility model are as follows:

[0018] The fluid switching device for the mine cooling system has the advantages of compact overall structure, convenient installation and maintenance, simple driving control logic, combination of two balance valve pipeline structures connected with the cylinder body and the high-pressure fluid connection pipe and the low-pressure fluid connection pipe into one, formation of a novel fluid switching device, realization of three communication states, good sealing effect, avoidance of high-low pressure fluid flow and pressure, and ensured safe operation of the device. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a cross-sectional schematic view of the fluid switching device of the utility model in the first kind of communication state;

[0020] Figure 2 is a cross-sectional schematic view of the fluid switching device of the utility model in the special transition state;

[0021] Figure 3 is a cross-sectional schematic view of the fluid switching device of the utility model in the second kind of communication state;

[0022] Figure 4 is a cross-sectional schematic view of the switching body in the fluid switching device of the utility model;

[0023] Figure 5 is a cross-sectional schematic view of the inner cylinder in the fluid switching device of the utility model;

[0024] Figure 6 is a cross-sectional schematic view of the switching column in the fluid switching device of the utility model.

[0025] In the above-mentioned drawing: 1: switching body, 11: first interface, 12: second interface, 13: third interface, 14: fourth interface;2: inner cylinder, 21: first recess, 22: second recess, 23: flow hole, 24: third recess, 25: outer boss, 26: inner boss;3: switching column;31: shaft section, 32: limiting shaft shoulder, 33: first dynamic sealing groove, 34: column section, 35: second dynamic sealing groove;4: blind end. DETAILED DESCRIPTION

[0026] The following embodiments are used to further describe the present application in detail, and the following embodiments can make the professional technical personnel more fully understand the present application, but do not limit the present application in any way.

[0027] As Figures 1 to 3 shown, the fluid switching device for mine cooling system of the utility model mainly comprises switching body 1, inner cylinder 2, switching column 3 and blind end 4.

[0028] As Figure 4 shown, switching body 1 includes an axially through circular main pipe, and the two ends of the circular main pipe are respectively provided as first interface 11 and third interface 13. The circular main pipe of switching body 1 is communicated with two circular branch pipes, and the axial direction of the circular branch pipe is arranged along the radial direction of the circular main pipe, and the ports of the two circular branch pipes are respectively provided as second interface 12 and fourth interface 14. Second interface 12 is located between first interface 11 and fourth interface 14, and fourth interface 14 is located between second interface 12 and third interface 13. Among them, the inner rotary surface of third interface 13 is provided with a recess, and the inner diameter of the recess is greater than the inner diameter of the circular main pipe, which is used for cooperating with the outer boss 25 of the inner cylinder 2 to realize the limiting installation of the inner cylinder 2.

[0029] Combination Figure 5 As shown, the inner cylinder 2 is fitted inside the switching body 1. The inner cylinder 2 is an axially continuous circular tube, and its outer diameter matches the inner diameter of the circular main pipe of the switching body 1, so that it can be installed inside the switching body 1 and form a clearance fit with the switching body 1. A second groove 22 is provided in the middle section along the axial direction of the inner cylinder 2. The second groove 22 is arranged around the circumference of the inner cylinder 2 on the outer rotating surface of the inner cylinder 2. After the inner cylinder 2 is installed inside the switching body 1, its second groove 22 corresponds to the position of the fourth interface 14. Multiple flow holes 23 are provided in the second groove 22. The multiple flow holes 23 are arranged around the circumference of the inner cylinder 2 in the second groove 22, which not only realizes the communication between the inner flow channel of the inner cylinder 2 and the fourth interface 14, but also ensures sufficient communication area to reduce local flow resistance loss. As a preferred embodiment, multiple sets of flow holes 23 are evenly spaced along the circumference of the inner cylinder 2, and the multiple flow holes 23 in each set are evenly spaced along the axial direction of the inner cylinder 2. The cross-sectional shape of the flow hole 23 is not unique; it can be a round hole, a square hole, or other shapes. Its maximum size is smaller than the width of the dynamic sealing structure of the switching column 3, so as to avoid cutting the dynamic sealing structure of the switching column 3 during reciprocating motion, thereby enhancing the sealing effect and service life.

[0030] The second groove 22 is provided with a first groove 21 and a third groove 24 between the two ends of the inner cylinder 2. The first groove 21 and the third groove 24 are arranged around the outer rotating surface of the inner cylinder 2 for installing a static sealing structure.

[0031] An outer boss 25 and an inner boss 26 are provided at one end of the inner cylinder 2. The outer boss 25 and the inner boss 26 are arranged in a circle around the outer and inner rotating surfaces of the inner cylinder 2, respectively, and are integrally formed. The outer diameter of the outer boss 25 matches the inner diameter of the groove of the third interface 13 of the switching body 1, and is used to limit the inner cylinder 2. The inner diameter of the inner boss 26 is smaller than the outer diameter of the column section 34 of the switching column 3, and is used to limit the end of the column section 34 of the switching column 3.

[0032] Combination Figure 6 As shown, the switching column 3 is installed inside the switching body 1 and the inner cylinder 2. The switching column 3 includes a shaft section 31 and a column section 34. The column section 34 is used to move axially within the inner cylinder 2 without detaching from the inner cylinder 2. The shaft section 31 and the column section 34 of the switching column 3 can be integrally formed or assembled into a whole using a separate structure.

[0033] The outer diameter of the shaft section 31 is smaller than that of the column section 34, and the outer diameter of the column section 34 matches the inner diameter of the inner cylinder 2, allowing the column section 34 to move axially relative to the inner cylinder 2. The end of the shaft section 31 is provided with a threaded structure for connecting an external drive mechanism. A limiting shoulder 32 is also provided on the outer side of the shaft section 31 to limit the switching column 3 to the blind end 4.

[0034] The column section 34 is provided with a first dynamic sealing groove 33 and a second dynamic sealing groove 35 at axial intervals. Both the first dynamic sealing groove 33 and the second dynamic sealing groove 35 are arranged circumferentially around the outer rotating surface of the column section 34 for installing dynamic sealing structures. The distance between the two dynamic sealing structures is greater than the inner diameter of the fourth interface 14, which is used to cut off the connection between the second interface 12, the third interface 13 and the fourth interface 14. The column section 34 of the switching column 3 can adopt two or more dynamic sealing structures, or an integral dynamic sealing structure, such as a PEEK liner seal, can be set on the outer rotating surface of the column section 34. The integral dynamic sealing structure is arranged circumferentially around the outer rotating surface of the column section 34, and the axial length of the integral dynamic sealing structure is greater than the inner diameter of the fourth interface 14.

[0035] The blind end 4 is connected to the first interface 11 of the switching body 1. The blind end 4 is provided with a static sealing groove for establishing a static sealing structure between itself and the switching body 1. A through hole is provided on the central axis of the blind end 4, which allows the shaft section 31 of the switching column 3 to pass through, enabling the outer end of the shaft section 31 to be connected to an external drive mechanism. The blind end 4 is provided with a dynamic sealing groove, and a dynamic sealing structure is established between itself and the shaft section 31 to prevent fluid leakage from the shaft section 31 of the switching column 3.

[0036] As can be seen, the length of the inner cylinder 2 extends from the third interface 13 of the switching body 1 to between the second interface 12 and the fourth interface 14. When the switching column 3 moves to the point where its column section 34 is limited by the inner boss 26 of the inner cylinder 2, the column section 34 is within the range of the inner cylinder 2 between the third interface 13 and the fourth interface 14 (excluding the third interface 13 and the fourth interface 14), and at this time, the shaft section 31 does not disengage from the through hole of the blind end 4. When the switching column 3 moves to the point where its shaft section 31 is limited by the blind end 4, the column section 34 is located within the range of the inner cylinder 2 between the second interface 12 and the fourth interface 14 (excluding the second interface 12 and the fourth interface 14).

[0037] Driven by an external drive mechanism, the switching column 3 reciprocates axially along the inner cylinder 2 within a limited distance, thereby connecting different fluid channels. Specifically, as shown... Figure 1 This is a schematic diagram of the first connected state. In this state, the end of the column section 34 of the switching column 3 is limited by the inner boss 26 of the inner cylinder 2. Therefore, the second interface 12 is connected to the fourth interface 14 through the flow hole 23 of the inner cylinder 2, while the third interface 13 is not connected to the fourth interface 14. For example... Figure 2 This is a schematic diagram of a special transitional state. In this state, the column section 34 of the switching column 3 is located at the second groove 22 of the inner cylinder 2. The dynamic sealing structure of the column section 34 is located at both ends of the second groove 22 or blocks the flow hole 23, ensuring a special transitional state where the second interface 12 and the fourth interface 14 are not connected, and the third interface 13 and the fourth interface 14 are not connected. (See diagram below.)Figure 3 The fourth interface 14 is in communication with the third interface 13, and the second interface 12 is not in communication with the fourth interface 14.

[0038] The first interface 11, the second interface 12, the third interface 13, the fourth interface 14 and the blind end 4 are not unique in the connection mode of the switching body 1, and can adopt flange connection, threaded connection and the like.

[0039] The fluid switching device designed in the utility model is used for the pressure energy conversion device in the mine cooling system, the fourth interface 14 of the switching body 1 is connected with a cylinder body, the third interface 13 is connected with a high-pressure fluid interface, and the second interface 12 is connected with a low-pressure fluid interface.

[0040] As shown in FIG. 1, the switching body 1 is in the first communication state, and the fourth interface 14 is in communication with the second interface 12. Figure 1 When the switching column 3 is in the first communication state, the fourth interface 14 is in communication with the second interface 12, the high-pressure fluid in the cylinder body is directly contacted with the low-pressure fluid from the second interface 12, the pressure of the high-pressure fluid in the cylinder body is reduced, and the pressure pre-balancing is completed.

[0041] As shown in FIG. 1, the switching body 1 is in the first communication state, and the fourth interface 14 is in communication with the second interface 12. Figure 2 As shown in FIG. 3, the switching body 1 is in the special transition state, and the two dynamic sealing structures on the column section 34 of the switching column 3 are located outside the two ends of the flow-through hole 23, so that the special transition state that the second interface 12 is not in communication with the fourth interface 14 and the third interface 13 is not in communication with the fourth interface 14 is ensured.

[0042] As shown in FIG. 3, the switching body 1 is in the special transition state, and the two dynamic sealing structures on the column section 34 of the switching column 3 are located outside the two ends of the flow-through hole 23, so that the special transition state that the second interface 12 is not in communication with the fourth interface 14 and the third interface 13 is not in communication with the fourth interface 14 is ensured. Figure 3 When the switching column 3 is in the second communication state, the fourth interface 14 is in communication with the third interface 13, the low-pressure fluid in the cylinder body is directly contacted with the high-pressure fluid from the third interface 13, the pressure of the low-pressure fluid in the cylinder body is increased, and the pressure pre-balancing is completed.

[0043] When the device is in the first communication state, the external driving mechanism keeps the inner boss 26 of the inner cylinder 2 from limiting the end of the column section 34 of the switching column 3 by overcoming the small differential pressure force of the two end faces of the column section 34. When the device switches from the first communication state to the second communication state, the external driving mechanism drives the switching column 3 to move axially away from the third interface 13, at this time the differential pressure force of the two end faces of the column section 34 is the power, which is beneficial to the switching process. When the two dynamic sealing structures on the column section 34 are located outside the two ends of the flow-through hole 23, the fourth interface 14 is not communicated with the second interface 12 and the third interface 13, and the device is in a special transition state. The external driving mechanism drives the switching column 3 to continue to move axially away from the third interface 13 until the limiting shaft shoulder 32 on the switching column 3 contacts the inner end face of the blind end 4, which limits the continuous movement of the switching column 3, and the device is in the second communication state. When the device switches from the second communication state to the first communication state, the process is opposite to the above description.

[0044] Although the preferred embodiments of the present application are described above with reference to the drawings, the present application is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative and not restrictive. Those skilled in the art can make many specific changes to the embodiments under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and these changes all belong to the protection scope of the present application.

Claims

1. A fluid switching device for a mine cooling system, comprising a switching body; characterized by, The switching body comprises an axially through circular main pipe, two ends of the circular main pipe are respectively provided as a first interface and a third interface; the circular main pipe of the switching body is communicated with two circular branch pipes, the axial direction of the circular branch pipe is arranged along the radial direction of the circular main pipe, and the ports of the two circular branch pipes are respectively provided as a second interface and a fourth interface; wherein, the fourth interface is located between the second interface and the third interface; wherein, the inner rotary surface of the third interface is provided with a groove, the inner diameter of the groove is greater than the inner diameter of the circular main pipe, and the groove is matched with an outer boss to realize the limiting installation of the inner cylinder; The switching body is internally provided with an inner cylinder, the outer diameter of the inner cylinder matches the inner diameter of the circular main pipe of the switching body; the inner cylinder is axially provided with a second groove corresponding to the position of the fourth interface, the second groove is arranged on the outer rotary surface of the inner cylinder along the whole circumference; and the second groove is provided with a plurality of flow holes, the plurality of flow holes are arranged along the whole circumference of the inner cylinder in the second groove, and the flow holes can communicate between the inner flow channel of the inner cylinder and the fourth interface; the inner cylinder is axially provided with a first groove and a third groove between the second groove and the two ends of the inner cylinder, the first groove and the third groove are both arranged on the outer rotary surface of the inner cylinder along the whole circumference, and are both used for installing a static sealing structure; one end of the inner cylinder is provided with an outer boss and an inner boss, the outer boss and the inner boss are arranged along the whole circumference on the outer rotary surface and the inner rotary surface of the inner cylinder respectively; the outer diameter of the outer boss matches the inner diameter of the groove of the third interface, and the outer boss is used for limiting the inner cylinder; the inner diameter of the inner boss is smaller than the outer diameter of the column section of the switching column, and the inner boss is used for limiting the end of the column section; The switching body and the inner cylinder are internally provided with the switching column, the switching column comprises a shaft section and a column section, the column section can axially move within the range of the inner cylinder; the outer diameter of the shaft section is smaller than the column section; the outer diameter of the column section matches the inner diameter of the inner cylinder, so that the column section can axially move relative to the inner cylinder; the end of the shaft section penetrates through a blind end, and is used for connecting an external driving mechanism; the shaft section is provided with a limiting shaft shoulder, the limiting shaft shoulder is used for limiting the switching column in the blind end; the column section of the switching column is provided with a dynamic sealing structure, when the dynamic sealing structure is located at both ends of the second groove or blocks the flow hole of the second groove, the fourth interface is not communicated with the second interface and the third interface; The first interface of the switching body is connected with a blind end, and a static sealing structure is arranged between the blind end and the switching body; a through hole is formed in the center axis of the blind end in the axial direction, the through hole is used for penetrating the shaft section of the switching column, and a dynamic sealing structure is arranged between the blind end and the shaft section; The length of the inner cylinder extends from the third interface of the switching body to between the second interface and the fourth interface; when the switching column moves to the state that the column section is limited by the inner boss of the inner cylinder, the column section is in the range of the inner cylinder between the third interface and the fourth interface; when the switching column moves to the state that the shaft section is limited by the blind end, the column section is in the range of the inner cylinder between the second interface and the fourth interface.

2. The fluid switching device for mine cooling system according to claim 1, wherein A plurality of groups of the flow-through holes are uniformly distributed along the circumference of the inner cylinder, and the flow-through holes in each group are uniformly distributed along the axial direction of the inner cylinder.

3. The fluid switching device for a mine cooling system according to claim 1, wherein The maximum dimension of the cross section of the flow-through hole is smaller than the width of the dynamic sealing structure of the switching column.

4. The fluid switching device for a mine cooling system according to claim 1, wherein The outer boss and the inner boss are integrally formed.

5. The fluid switching device for a mine cooling system of claim 1, wherein, The end of the shaft section is provided with a threaded structure for connecting an external driving mechanism.

6. The fluid switching device for a mine cooling system of claim 1, wherein, The column section is provided with a first dynamic sealing groove and a second dynamic sealing groove which are spaced apart along the axial direction, the first dynamic sealing groove and the second dynamic sealing groove are arranged along the outer rotary surface of the column section in a whole circle, and are used for mounting dynamic sealing structures; the axial distance between the two dynamic sealing structures is greater than the inner diameter of the fourth interface.

7. The fluid switching device for a mine cooling system of claim 1, wherein, The column section is provided with an integral dynamic sealing structure which is arranged along the outer rotary surface of the column section in a whole circle, and the axial length of the integral dynamic sealing structure is greater than the inner diameter of the fourth interface.

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